Re: [APML] Knife edge focusing question

["bert katzung" <katzung1@home.com>]

Thanks, Warren:
Sounds like you have a lot of experience with it. I'll certainly get the
hang of it one of these days. With my scopes varying from f3.3 to f9, I've
got plenty of work to do. And thanks very much for the offer of phone help,
but my phone is quite out of reach of the scope set up.
Hope some others are learning from this thread; I certainly am!
Bert

Bert Katzung
katzung1@home.com
www.astronomy-images.com

----- Original Message -----
From: "warren and amy keller" <warhen@mindspring.com>
To: <astro-photo@seds.org>
Sent: Thursday, 02 August, 2001 8:05 AM
Subject: Re: [APML] Knife edge focusing question


> Bert,
>         I'm newly converted and it's one of those acquired sensations like
> bike riding or sounding a tone on a reed instrument- You absolutely can
not
> do it until one day you do, then you never lose it.
> > Obviously, there's some simple thing that I'm not doing, but what is it?
>
> Not really Bert, I found it tough to learn and I had help. One thing which
> is key is starting as near focus as you can get. The tendency is to rack
> through both sides of focus expecting a change and there is none. The
> curtain appears nearer focus based upon the stars movement relative to the
> scope in dec. or the knife. That's the curtain which descends as the ke
cuts
> in to the light. Once you get the curtain to disappear and the star to
wink
> out, then you fine-tune to see a lovely pattern of even brightening.
>
> If you can't find anyone to help you, why not try calling one of us while
> you are attempting it? I volunteer though there are much more experienced
of
> us.
>
> Warren
>
>
>
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